Electric cooker.



P.' JOHNSON. ELECTRIC GOOKER.

APPLICATION FILED JULY s, 1013,

2 SHEETS-SHEET l.

Patented May 5, 1914.

' P. JOHNSON.

ELECTRIC GOOKER.

APPLICATION FILED JULY 3,1913.

1,095,214, v A 'patented May 5, 1914.

2 SHEETS-SHEET 2.

- UNrrEDV `sra'rns rrrrani ernten.

.PAUL JOHNSON, OF WINNPEG, MAWTGBA, CANADA.

ELECTRC KL To all whom it may concern Be it known that I, PAUL JOHNSON, a citizen of the Dominion of Canada, residing in the city of l/Vinnipeg, inthe Province of Manitobaand Dominion of Canada, electrician, have invented certain new and useful Improvements in Electric Cookers. of whichthe following is a specification.

This invention relates particularly to electric cookers which maybe carried 'from place to place and which may be connected by cord to lamp sockets wherever available, to obtain the necessary current.

The objects of my invention have been to provide a device of this character of perfect safetyand one in which the intensity of the heat is under control, and which may be produced at a cost much below that ot dcvices of a similar nature now on the n'iarket. l attain these objects by the means set out in the specifications and claim following,

and fully illustrated in the accompanying drawings in which,

Figure 1 is an elevation of the complete device. Fig. 9. is a sectional view on the line A-B in Fig. 1. Fig. 3 is a circuit diagram showing the connections which may be used in a double or two heat cooker. Fig. 4 is a plan view of the device'. Fig. 5 a view of the upper non-conducting ring. Fig. C is the grating removed from the heater. Fig. 7 is the lower non-conducting pad with spacing ring and bars. Fig. 8 is a fragment showing the bottom of the device, as it might be made to adapt it for use with an ordinary range.

Referringto the drawings in which simi- Alarnumerals .refer to similar parts throughout, it will be observed that in outward appearancethe device resembles a shallow circular pan having a handle on onelside, connection plugs extending` from its opposite side, and legs adapted to, support it upon a table or other suitablebase.

The casing 1 is made of metal, preferably Specification of Letters went Application led July 3, 1913.

enameled to insure safety, though this isE not absolutely necessary as the construction of the device throughout embodies such precautions as to insulation as make it impossible that the electric current employed could person handling it. As mentioned the case y 1 may be provided with legs 2, or the botcirculate through the case '1 and endanger a i l i Patented Hay 5, 1914.

Serial No. 777,243.

structure of the range itself, the upper part of the case 1 taking the place of the lid open ings and being adapted to receive the bottom of pots kettlcs or pans in the usual way. For use a portable utensil however, it is better that the device be provided with legs as shov-:n in Figs. 1 and 2. These may be merely porcelain knobs, or they may be of rubber or otl er material less liable to injure the top of th c. )le or other article of -turniture upon which they may rest.

lntcriorly disposed upon the bottom ot 'the case 1 is layer or pad of non-conducting material e, and immediately above this is` are spacing bars (3, which, with the ring 5 serve to support in spaced relation to the pad el, a disk 'l' which' in cross and circular dimension lits the interior of the case 1. Thus a series of air spaces is formed between the pad 1 and the disk 7. Above and resting upon the disk 7, a ring S lines the eircumerence of the case 1, and supports a circular and removable grating 9.

lt is preferable that the pad 4, the ring 5, the spacing bars G, the disk 7, and the lining ring 8 be all of the same heat resisting and noirconducting material, and I have found asbestos board a very suitable material Jfor the purpose.

The pad l, the ring 5 and the spacing bars (3 are shown as one in Fig. 7, but it will be understood that these may be, and preferably arc, separate pieces, and are only brought together as the device is built up.

Secured to the upper side of the disk 7 are the resistance coils 10, 11, 12, 13, 14, 15, 1G, and 17, having tcrn'iinals. 1S, 19, and 20 tor connection with conducting-wil'es from which .a current ot electricity may be obtained to energize the coils. The coils are eoreless may be connected up with the terminals and with each other in any manner deemed advisable, that is to say, they may be single unit. or they may bc grouped in units of two or more coils each, controlling means being introduced whereby as many units as are required may be operated together to obtain a desired result. Fig. 3 is a circuit diagram showing the coils divided into two groups, the evenlynumbe'red coils 10, `12, 14:, and iti-being connected in series to form one group, and the oddly numbered coils 11, 13, 1 5, and 17 forming the second group. The pin 18 is the positive terminal of both groups, the pin 19 the negative terminal of the evenly numbered groups, and the pin 2O the negative terminal of the combined group. The conductor cords or wires 21 and 22, connect with stationary circuit leads, and pass into a member 23 of insulating material. The member 23 contains three sockets 24, 25, and 26 adapted to receive the terminal pins 18, 19 and 20 respectively, and the positive cord 21 connects directly with the socket 2li Aand thus with the positive terminal 18 of the coils. The cord 22 connects with a switch 27 in the member .43, which may be thrown to connect either with the socket 25 thus closing the circuit through' the evenly numbered coils, or with the socket 26 which is in contact with the terminal pin 20. As the diagram plainly shows, if

the switch 27 be placed to connect the cord 22 with the terminal 19 the current will passthrough the coils 10, 12, 14, and 16 generating the amount of heat due to the resistance` met with in these coils only, but if the switch be thrown to connect with the terminal 20, the terminal 19 will become a dead end, the current passing from the coil 16 through the wire 28 to the coil 11,- tlience through the coils 13, 15 and 17 to the terminal 20, thus approximately halving the heating eii'ect oi the device. This description illustrates in a siinplemeasure the ease with which the device may be arrangedvto give off heat of `varying intensity, and is not intended to be exhaustive. As it requires acertaiii amount of forcevto remove the member 28 from its connection with the terminals 1S, 19 and 2O, a handle29 is provided on the opposite side oi the casing l by which the device may be heldwhile this is being done.

It is preferable that the top of the nonvconducting ring 8 be kept below the upper edge of the casing 1 thus forming alledge around the interiorv of the casing upon which to rest the grating 9. The grating 9, I pre! fer to make of woven Wire, though Various other constructions will suggest themselves, and to have the same ft the casing snugly though ,in such manner that it may be removed for cleaning pur oses Without diit culty. The grating may e used directly for toasting purposes, and it is a'dapted to support a variety of cooking utensils oi smaller diameter than that of the case 1. Vessels of larger circumference than that of the case may rest directly upon' the upper edgev iing circumferentially disposed in the cas-` ing above said pad, and bars disposed in spaced relation upon the upper surface of said pad and crossing the interior of said ring, a disk equal in diameter to the interior oi said casing supported by said ring and bars, and a second ring of outer diameter equal to the interior diameter of said casing disposed above said disk, a cooking grate, said last named ring adapted to maintain `the disposition of said disk, padY bars and i'st named ring iii said casing, and to support on its upper edge said cooking grate, a plurality oi coreless heating coils supported .b v and secured to the upper surface of said disk in parallel spaced relation to each other, and connected in series, the terminals oi said coils passing through the side of said casing, and disengageably connecting with a flexible conductor leading to a source of electrical energy.

In testimony whereof I aiiix my signature in presence of two witnesses.

Vvvtnesscs:

Tillmann I-I. WvrsoN, i Gian'rin Bonn'i. 

